At 26 years old, the other Olsen twin is making her 43-year-old beau Olivier Sarkozy wait to propose to her, even though the French billionaire is dying to put a ring out, sources reveal in the April 8 issue of Us Weekly.

The once-wed multimillionaire “wants to lock her down for life,” an insider says of Sarkozy. “He calls her ‘smart as a whip’ and says she’s mature for her age.”

The actress-turned-designer began dating the French banker 10 months ago, and “she’s making him wait,” a source tells Us. Adds another, “Mary-Kate wants to give it more time. She’s not in any rush.”

Who calls the love of their life “smart as a whip?” That’s a compliment reserved for like…a child. Again, who actually supports this couple? The only thing I ever see them doing together is smoking and strolling around with Sarkozy’s kid! C’mon, girl! Let’s find you a young, hot one.